Grove of Dreams

The Grove of Dreams is a place where players may encounter Mythical Pokémon Jirachi. It has 3 big trees -- a huge regular tree, a tree of water and a tree of fire, housing 3 Pokémon that are known as the "Elemental Monkeys".

Catching Jirachi
Underneath the rock wall behind the regular tree, there is a secret tunnel covered by some vines. Players can walk through which leads to the fabled ancient ruins explorers in the area have been looking for. If players walk up to the shrine overnight, stand in the middle and say "I wish for (Anything in 1 word)", a cutscene will happen and a battle will be initiated with a Lv.25 Jirachi. Players only have 1 chance to catch it, so save beforehand and turn off the auto save function. As Jirachi is very hard to catch and only appears overnight, it is recommended to postpone the catch and purchase a lot of Dusk Balls in Poké Ball Emporium, Anthian City - Shopping District before returning to capture Jirachi.

Catching Elemental Monkeys
Before entering Grove of Dreams, put a Fire-type, Water-type or Grass-type Pokémon in the first slot of party. The corresponding Elemental Monkeys may appear under their respective huge trees, click on those Pokémon to start the battle. If the Pokémon did not appear, exit to Route 9 and enter again. More information can be found here.

Mythical Pokémon
Players only have 1 chance to battle the following Pokémon. Save beforehand and turn off the Auto Save function.

Special
The following Pokémon may appear under their respective big trees if the player has a type matching Pokémon in the first slot of his or her party. If they did not appear, exit to Route 9 and enter again.

Trivia

 * Behind the Tree of Fire is a caved-in mineshaft with what appears to be Legendary Pokémon Registeel's eye pattern above it, which hints to a chance for capturing Registeel in the future.
 * The music in Grove of Dreams is based on Lush Forest from the side series game Pokémon Super Mystery Dungeon.
 * To be more exact, it is the remix version made by a famous music remix creator GlitchxCity.